feat(web): add basic past-session search (round 1)

packages/host/apiproxy/src/api-proxy.ts

@@ -11,6 +11,7 @@ import type { Agent, AgentMessage, AgentMessageId, AgentStatus } from '@deepseek
 import type { ContentBlock, MessageSource } from '@deepseek-ai/dsh-llm'
 import type { JsonValue, Session, SessionEvent, SessionHeader, SessionId } from '@deepseek-ai/dsh-session'
 import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
+import { SessionQueryError } from '@deepseek-ai/dsh-session-query'
 import { foldSessionTitle } from '@deepseek-ai/dsh-session-title'
 import type { Workspace, WorkspaceRecord } from '@deepseek-ai/dsh-workspace'
 import {
@@ -20,8 +21,8 @@ import {
 // Type-only: brings the `ctx.tools` Context merge into this program (viewFor reads presenters).
 import type {} from '@deepseek-ai/dsh-tools'
 import type {
-  ApiProxy, HistoryEntry, HostFrame, MuxFrame, QuestionResponsePayload, SessionSummary, ToolEventView,
-  WorkspaceId, WorkspaceView,
+  ApiProxy, HistoryEntry, HostFrame, MuxFrame, QuestionResponsePayload, SessionSearchItem,
+  SessionSummary, ToolEventView, WorkspaceId, WorkspaceView,
 } from './api/index.ts'
 // Type-only edges: resolve `ctx.get('commands')`, the `commands/change` event, and `ctx.get('skills')`.
 import type {} from '@deepseek-ai/dsh-commands'
@@ -37,9 +38,17 @@ import { UserInteractionError } from '@deepseek-ai/dsh-user-interaction'
 /** Page size when history is called without maxMessages. */
 const DEFAULT_MAX_MESSAGES = 50
 
+/** Product contract: sidebar search returns one bounded page and no cursor. */
+const SESSION_SEARCH_LIMIT = 20
+
 /** Surface message event types (the pagination counting unit). */
 const MESSAGE_TYPES = new Set(['user/message', 'assistant/message', 'steering/message'])
 
+/** Read live abort state across awaits without treating it as synchronously immutable. */
+function isAborted(signal: AbortSignal): boolean {
+  return signal.aborted
+}
+
 /**
  * Message-boundary pagination: count maxMessages surface messages backwards from
  * the window tail; the cut is the starting seq of the oldest message group
@@ -561,6 +570,26 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
     return operation
   }
 
+  /**
+   * Build the session.list baseline shared by listing and search visibility.
+   * Attached sessions come from memory; servable cold sessions merge from
+   * persistence, and the final order is newest-first.
+   */
+  async function listVisibleSessionSummaries(): Promise<SessionSummary[]> {
+    const items = ctx.sessions.list().map((session) => {
+      const agent = ctx.agents.get(session.id)
+      return summarize(session, agent?.status === 'running')
+    })
+    const attached = new Set(items.map(item => item.sessionId))
+    const persistence = ctx.get('sessionPersistence')
+    if (persistence !== undefined) {
+      const cold = (await persistence.list()).filter(meta => !attached.has(meta.id) && meta.cwd !== undefined)
+      items.push(...await Promise.all(cold.map(meta => summarizeCold(persistence, meta))))
+    }
+    items.sort((a, b) => b.updatedAt - a.updatedAt)
+    return items
+  }
+
   return {
     sessions: {
       // Attached sessions summarize from memory; persisted-but-unattached (cold)
@@ -568,18 +597,61 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
       // Legacy logs without a cwd (pre-project stance) are not served — every
       // session now records its project at create time.
       async list(request) {
-        const items = ctx.sessions.list().map((session) => {
-          const agent = ctx.agents.get(session.id)
-          return summarize(session, agent?.status === 'running')
+        return ok(request, { items: await listVisibleSessionSummaries() })
+      },
+
+      async search(request, signal) {
+        const cancelled = () => err<{ items: SessionSearchItem[]; hasMore: boolean }>(request, {
+          code: 'cancelled',
+          message: 'session search was aborted',
+          details: {},
         })
-        const attached = new Set(items.map(item => item.sessionId))
-        const persistence = ctx.get('sessionPersistence')
-        if (persistence !== undefined) {
-          const cold = (await persistence.list()).filter(meta => !attached.has(meta.id) && meta.cwd !== undefined)
-          items.push(...await Promise.all(cold.map(meta => summarizeCold(persistence, meta))))
+        if (isAborted(signal)) return cancelled()
+        const sessionQuery = ctx.get('sessionQuery')
+        if (sessionQuery === undefined) {
+          return err(request, {
+            code: 'internal',
+            message: 'session search is unavailable: this deployment does not mount @deepseek-ai/dsh-session-query',
+            details: {},
+          })
+        }
+        try {
+          const visible = await listVisibleSessionSummaries()
+          if (isAborted(signal)) return cancelled()
+          if (visible.length === 0) return ok(request, { items: [], hasMore: false })
+          const visibleIds = new Set(visible.map(item => item.sessionId))
+          const page = await sessionQuery.searchSessions({
+            query: request.payload.query,
+            sessionFilters: [{ kind: 'id', values: [...visibleIds] }],
+            eventFilters: [
+              { kind: 'type', values: ['user/message', 'assistant/message', 'steering/message'] },
+              { kind: 'surface', values: ['current'] },
+            ],
+            limit: SESSION_SEARCH_LIMIT,
+          }, { signal })
+          if (isAborted(signal)) return cancelled()
+          // The id filter is the authorization boundary. Re-check the provider
+          // projection before emitting it so a backend regression cannot leak
+          // a session that `session.list` withheld.
+          const authorized = page.items.filter(hit => visibleIds.has(hit.header.id))
+          return ok(request, {
+            items: authorized.slice(0, SESSION_SEARCH_LIMIT).map(hit => ({
+              sessionId: hit.header.id,
+              snippet: hit.bestMatch.snippet,
+            })),
+            hasMore: page.nextCursor !== undefined || authorized.length > SESSION_SEARCH_LIMIT,
+          })
+        } catch (error: unknown) {
+          if (
+            isAborted(signal)
+            || (error instanceof SessionQueryError && error.code === 'SESSION_QUERY_ABORTED')
+          ) return cancelled()
+          return err(request, {
+            code: 'internal',
+            message: `session search failed: ${String(error)}`,
+            details: {},
+          })
         }
-        items.sort((a, b) => b.updatedAt - a.updatedAt)
-        return ok(request, { items })
       },
 
       async create(request) {

packages/host/apiproxy/src/api/index.ts

@@ -25,7 +25,7 @@ export interface ApiProxy {
 }
 
 // ---- Domain interfaces and payload entities ----
-export type { HistoryEntry, SessionsApi, SessionSummary } from './sessions.ts'
+export type { HistoryEntry, SessionSearchItem, SessionsApi, SessionSummary } from './sessions.ts'
 export type { HostApi } from './host.ts'
 export type { WorkspaceApi, WorkspaceId, WorkspaceView } from './workspace.ts'
 export type { CommandsApi, CommandDescriptor, CommandExecuteResult } from './commands.ts'

packages/host/apiproxy/src/api/rpc-map.ts

@@ -18,6 +18,7 @@ import type { RpcResponse } from './rpc.ts'
  */
 export interface RpcMethodMap {
   'session.list': SessionsApi['list']
+  'session.search': SessionsApi['search']
   'session.create': SessionsApi['create']
   'session.history': SessionsApi['history']
   'session.prompt': SessionsApi['prompt']

packages/host/apiproxy/src/api/sessions.schema.ts

@@ -9,7 +9,7 @@ import { z } from 'zod'
 import type { SessionEvent, SessionId } from '@deepseek-ai/dsh-session/types'
 import type { RequestPayload, ResponseValue } from './rpc-map.ts'
 import type { Wire } from './rpc.schema.ts'
-import type { HistoryEntry, SessionSummary } from './sessions.ts'
+import type { HistoryEntry, SessionSearchItem, SessionSummary } from './sessions.ts'
 import type { ToolEventView } from './events.ts'
 import type { WorkspaceId } from './workspace.ts'
 
@@ -54,6 +54,29 @@ export const sessionListValueSchema = z.object({
   items: z.array(sessionSummarySchema),
 }) satisfies z.ZodType<Wire<ResponseValue<'session.list'>>>
 
+/** Fixed wire bound for one interactive sidebar query. */
+const SESSION_SEARCH_QUERY_MAX_CHARS = 500
+/** Product response bound validated independently by every client carrier. */
+const SESSION_SEARCH_RESULT_LIMIT = 20
+
+/** session.search request payload. */
+export const sessionSearchRequestSchema = z.object({
+  query: z.string().trim().min(1).max(SESSION_SEARCH_QUERY_MAX_CHARS)
+    .refine(query => !query.includes('\0'), { message: 'search query must not contain NUL' }),
+}) satisfies z.ZodType<Wire<RequestPayload<'session.search'>>>
+
+/** One session.search result. */
+export const sessionSearchItemSchema = z.object({
+  sessionId: sessionIdSchema,
+  snippet: z.string(),
+}) satisfies z.ZodType<Wire<SessionSearchItem>>
+
+/** session.search response value. */
+export const sessionSearchValueSchema = z.object({
+  items: z.array(sessionSearchItemSchema).max(SESSION_SEARCH_RESULT_LIMIT),
+  hasMore: z.boolean(),
+}) satisfies z.ZodType<Wire<ResponseValue<'session.search'>>>
+
 /** session.create request payload (at most one of workspaceId / cwd). */
 export const sessionCreateRequestSchema = z.object({
   workspaceId: workspaceIdSchema.optional(),

packages/host/apiproxy/src/api/sessions.ts

@@ -53,11 +53,28 @@ export interface SessionSummary {
   cwd?: string
 }
 
+/** One session-content search result; display metadata stays owned by `session.list`. */
+export interface SessionSearchItem {
+  sessionId: SessionId
+  /** Plain-text excerpt around the strongest matching visible message. */
+  snippet: string
+}
+
 /** Session-domain unary methods (the map keys session.* of RpcMethodMap). */
 export interface SessionsApi {
   /** Lists persisted sessions (updatedAt descending). v1 returns everything; cursor is a reserved seat, unimplemented. */
   list(request: RpcRequest<{ cursor?: string }>): Promise<RpcResponse<{ items: SessionSummary[] }>>
 
+  /**
+   * Searches the current user/assistant/steering message surface across
+   * sessions visible to `list`. Results contain at most 20 sessions and carry
+   * no continuation cursor; `hasMore` asks the client to refine the query.
+   */
+  search(
+    request: RpcRequest<{ query: string }>,
+    signal: AbortSignal,
+  ): Promise<RpcResponse<{ items: SessionSearchItem[]; hasMore: boolean }>>
+
   /**
    * Creates a real session and its idle agent. At most one of `workspaceId` /
    * `cwd` is accepted; an omitted project uses the Host cwd. A caller may

packages/host/apiproxy/src/fetch/client.ts

@@ -20,6 +20,7 @@ import {
   sessionHistoryValueSchema,
   sessionListValueSchema,
   sessionPromptValueSchema,
+  sessionSearchValueSchema,
 } from '../api/sessions.schema.ts'
 import {
   workspaceCreateValueSchema,
@@ -48,6 +49,7 @@ import { skillListValueSchema } from '../api/skills.schema.ts'
 export interface IApiClient {
   sessions: {
     list(payload: RequestPayload<'session.list'>, signal?: AbortSignal): Promise<RpcResponse<ResponseValue<'session.list'>>>
+    search(payload: RequestPayload<'session.search'>, signal?: AbortSignal): Promise<RpcResponse<ResponseValue<'session.search'>>>
     create(payload: RequestPayload<'session.create'>, signal?: AbortSignal): Promise<RpcResponse<ResponseValue<'session.create'>>>
     history(payload: RequestPayload<'session.history'>, signal?: AbortSignal): Promise<RpcResponse<ResponseValue<'session.history'>>>
     prompt(payload: RequestPayload<'session.prompt'>, signal?: AbortSignal): Promise<RpcResponse<ResponseValue<'session.prompt'>>>
@@ -83,6 +85,7 @@ export interface IApiClient {
  */
 const UNARY_VALUE_SCHEMAS: { [K in keyof RpcMethodMap]: z.ZodType<Wire<ResponseValue<K>>> } = {
   'session.list': sessionListValueSchema,
+  'session.search': sessionSearchValueSchema,
   'session.create': sessionCreateValueSchema,
   'session.history': sessionHistoryValueSchema,
   'session.prompt': sessionPromptValueSchema,
@@ -271,6 +274,7 @@ export abstract class AbstractApiClient implements IApiClient {
 
   readonly sessions: IApiClient['sessions'] = {
     list: (payload, signal) => this.callUnary('session.list', payload, signal),
+    search: (payload, signal) => this.callUnary('session.search', payload, signal),
     create: (payload, signal) => this.callUnary('session.create', payload, signal),
     history: (payload, signal) => this.callUnary('session.history', payload, signal),
     prompt: (payload, signal) => this.callUnary('session.prompt', payload, signal),

packages/host/apiproxy/src/fetch/handler.ts

@@ -20,6 +20,7 @@ import {
   sessionHistoryRequestSchema,
   sessionListRequestSchema,
   sessionPromptRequestSchema,
+  sessionSearchRequestSchema,
 } from '../api/sessions.schema.ts'
 import { hostDescribeRequestSchema } from '../api/host.schema.ts'
 import {
@@ -38,7 +39,8 @@ import { skillListRequestSchema } from '../api/skills.schema.ts'
  * Schemas anchor to the Wire<> widening (the repo-wide exactOptionalPropertyTypes accommodation
  * documented on Wire); the dispatch point carries the one Wire→exact cast.
  * Every invoke receives the carrier Request's signal; methods whose contract
- * declares a signal parameter (command.execute) forward it, the rest ignore it.
+ * declares a signal parameter (session.search and command.execute) forward it,
+ * the rest ignore it.
  */
 type UnaryRoutes = {
   [K in keyof RpcMethodMap]: {
@@ -49,6 +51,7 @@ type UnaryRoutes = {
 
 const UNARY_ROUTES: UnaryRoutes = {
   'session.list': { schema: sessionListRequestSchema, invoke: (api, r) => api.sessions.list(r) },
+  'session.search': { schema: sessionSearchRequestSchema, invoke: (api, r, signal) => api.sessions.search(r, signal) },
   'session.create': { schema: sessionCreateRequestSchema, invoke: (api, r) => api.sessions.create(r) },
   'session.history': { schema: sessionHistoryRequestSchema, invoke: (api, r) => api.sessions.history(r) },
   'session.prompt': { schema: sessionPromptRequestSchema, invoke: (api, r) => api.sessions.prompt(r) },